4 Copyright (C) 2008 Cezary Jackiewicz <cezary.jackiewicz (at) gmail.com>
8 Copyright (C) 2006 Lennart Poettering <mzxreary (at) 0pointer (dot) de>
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 2 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful, but
16 WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
27 * comapl-laptop.c - Compal laptop support.
29 * This driver exports a few files in /sys/devices/platform/compal-laptop/:
31 * wlan - wlan subsystem state: contains 0 or 1 (rw)
33 * bluetooth - Bluetooth subsystem state: contains 0 or 1 (rw)
35 * raw - raw value taken from embedded controller register (ro)
37 * In addition to these platform device attributes the driver
38 * registers itself in the Linux backlight control subsystem and is
39 * available to userspace under /sys/class/backlight/compal-laptop/.
41 * This driver might work on other laptops produced by Compal. If you
42 * want to try it you can pass force=1 as argument to the module which
43 * will force it to load even when the DMI data doesn't identify the
47 #include <linux/module.h>
48 #include <linux/kernel.h>
49 #include <linux/init.h>
50 #include <linux/acpi.h>
51 #include <linux/dmi.h>
52 #include <linux/backlight.h>
53 #include <linux/platform_device.h>
55 #define COMPAL_DRIVER_VERSION "0.2.6"
57 #define COMPAL_LCD_LEVEL_MAX 8
59 #define COMPAL_EC_COMMAND_WIRELESS 0xBB
60 #define COMPAL_EC_COMMAND_LCD_LEVEL 0xB9
62 #define KILLSWITCH_MASK 0x10
63 #define WLAN_MASK 0x01
67 module_param(force
, bool, 0);
68 MODULE_PARM_DESC(force
, "Force driver load, ignore DMI data");
72 static int set_lcd_level(int level
)
74 if (level
< 0 || level
>= COMPAL_LCD_LEVEL_MAX
)
77 ec_write(COMPAL_EC_COMMAND_LCD_LEVEL
, level
);
82 static int get_lcd_level(void)
86 ec_read(COMPAL_EC_COMMAND_LCD_LEVEL
, &result
);
91 static int set_wlan_state(int state
)
95 ec_read(COMPAL_EC_COMMAND_WIRELESS
, &result
);
97 if ((result
& KILLSWITCH_MASK
) == 0)
101 value
= (u8
) (result
| WLAN_MASK
);
103 value
= (u8
) (result
& ~WLAN_MASK
);
104 ec_write(COMPAL_EC_COMMAND_WIRELESS
, value
);
110 static int set_bluetooth_state(int state
)
114 ec_read(COMPAL_EC_COMMAND_WIRELESS
, &result
);
116 if ((result
& KILLSWITCH_MASK
) == 0)
120 value
= (u8
) (result
| BT_MASK
);
122 value
= (u8
) (result
& ~BT_MASK
);
123 ec_write(COMPAL_EC_COMMAND_WIRELESS
, value
);
129 static int get_wireless_state(int *wlan
, int *bluetooth
)
133 ec_read(COMPAL_EC_COMMAND_WIRELESS
, &result
);
136 if ((result
& KILLSWITCH_MASK
) == 0)
139 *wlan
= result
& WLAN_MASK
;
143 if ((result
& KILLSWITCH_MASK
) == 0)
146 *bluetooth
= (result
& BT_MASK
) >> 1;
152 /* Backlight device stuff */
154 static int bl_get_brightness(struct backlight_device
*b
)
156 return get_lcd_level();
160 static int bl_update_status(struct backlight_device
*b
)
162 return set_lcd_level(b
->props
.brightness
);
165 static struct backlight_ops compalbl_ops
= {
166 .get_brightness
= bl_get_brightness
,
167 .update_status
= bl_update_status
,
170 static struct backlight_device
*compalbl_device
;
172 /* Platform device */
174 static ssize_t
show_wlan(struct device
*dev
,
175 struct device_attribute
*attr
, char *buf
)
179 ret
= get_wireless_state(&enabled
, NULL
);
183 return sprintf(buf
, "%i\n", enabled
);
186 static ssize_t
show_raw(struct device
*dev
,
187 struct device_attribute
*attr
, char *buf
)
191 ec_read(COMPAL_EC_COMMAND_WIRELESS
, &result
);
193 return sprintf(buf
, "%i\n", result
);
196 static ssize_t
show_bluetooth(struct device
*dev
,
197 struct device_attribute
*attr
, char *buf
)
201 ret
= get_wireless_state(NULL
, &enabled
);
205 return sprintf(buf
, "%i\n", enabled
);
208 static ssize_t
store_wlan_state(struct device
*dev
,
209 struct device_attribute
*attr
, const char *buf
, size_t count
)
213 if (sscanf(buf
, "%i", &state
) != 1 || (state
< 0 || state
> 1))
216 ret
= set_wlan_state(state
);
223 static ssize_t
store_bluetooth_state(struct device
*dev
,
224 struct device_attribute
*attr
, const char *buf
, size_t count
)
228 if (sscanf(buf
, "%i", &state
) != 1 || (state
< 0 || state
> 1))
231 ret
= set_bluetooth_state(state
);
238 static DEVICE_ATTR(bluetooth
, 0644, show_bluetooth
, store_bluetooth_state
);
239 static DEVICE_ATTR(wlan
, 0644, show_wlan
, store_wlan_state
);
240 static DEVICE_ATTR(raw
, 0444, show_raw
, NULL
);
242 static struct attribute
*compal_attributes
[] = {
243 &dev_attr_bluetooth
.attr
,
249 static struct attribute_group compal_attribute_group
= {
250 .attrs
= compal_attributes
253 static struct platform_driver compal_driver
= {
255 .name
= "compal-laptop",
256 .owner
= THIS_MODULE
,
260 static struct platform_device
*compal_device
;
264 static int dmi_check_cb(const struct dmi_system_id
*id
)
266 printk(KERN_INFO
"compal-laptop: Identified laptop model '%s'.\n",
272 static struct dmi_system_id __initdata compal_dmi_table
[] = {
274 .ident
= "FL90/IFL90",
276 DMI_MATCH(DMI_BOARD_NAME
, "IFL90"),
277 DMI_MATCH(DMI_BOARD_VERSION
, "IFT00"),
279 .callback
= dmi_check_cb
282 .ident
= "FL90/IFL90",
284 DMI_MATCH(DMI_BOARD_NAME
, "IFL90"),
285 DMI_MATCH(DMI_BOARD_VERSION
, "REFERENCE"),
287 .callback
= dmi_check_cb
290 .ident
= "FL91/IFL91",
292 DMI_MATCH(DMI_BOARD_NAME
, "IFL91"),
293 DMI_MATCH(DMI_BOARD_VERSION
, "IFT00"),
295 .callback
= dmi_check_cb
298 .ident
= "FL92/JFL92",
300 DMI_MATCH(DMI_BOARD_NAME
, "JFL92"),
301 DMI_MATCH(DMI_BOARD_VERSION
, "IFT00"),
303 .callback
= dmi_check_cb
306 .ident
= "FT00/IFT00",
308 DMI_MATCH(DMI_BOARD_NAME
, "IFT00"),
309 DMI_MATCH(DMI_BOARD_VERSION
, "IFT00"),
311 .callback
= dmi_check_cb
316 static int __init
compal_init(void)
323 if (!force
&& !dmi_check_system(compal_dmi_table
))
326 /* Register backlight stuff */
328 if (!acpi_video_backlight_support()) {
329 compalbl_device
= backlight_device_register("compal-laptop", NULL
, NULL
,
331 if (IS_ERR(compalbl_device
))
332 return PTR_ERR(compalbl_device
);
334 compalbl_device
->props
.max_brightness
= COMPAL_LCD_LEVEL_MAX
-1;
337 ret
= platform_driver_register(&compal_driver
);
341 /* Register platform stuff */
343 compal_device
= platform_device_alloc("compal-laptop", -1);
344 if (!compal_device
) {
346 goto fail_platform_driver
;
349 ret
= platform_device_add(compal_device
);
351 goto fail_platform_device1
;
353 ret
= sysfs_create_group(&compal_device
->dev
.kobj
,
354 &compal_attribute_group
);
356 goto fail_platform_device2
;
358 printk(KERN_INFO
"compal-laptop: driver "COMPAL_DRIVER_VERSION
359 " successfully loaded.\n");
363 fail_platform_device2
:
365 platform_device_del(compal_device
);
367 fail_platform_device1
:
369 platform_device_put(compal_device
);
371 fail_platform_driver
:
373 platform_driver_unregister(&compal_driver
);
377 backlight_device_unregister(compalbl_device
);
382 static void __exit
compal_cleanup(void)
385 sysfs_remove_group(&compal_device
->dev
.kobj
, &compal_attribute_group
);
386 platform_device_unregister(compal_device
);
387 platform_driver_unregister(&compal_driver
);
388 backlight_device_unregister(compalbl_device
);
390 printk(KERN_INFO
"compal-laptop: driver unloaded.\n");
393 module_init(compal_init
);
394 module_exit(compal_cleanup
);
396 MODULE_AUTHOR("Cezary Jackiewicz");
397 MODULE_DESCRIPTION("Compal Laptop Support");
398 MODULE_VERSION(COMPAL_DRIVER_VERSION
);
399 MODULE_LICENSE("GPL");
401 MODULE_ALIAS("dmi:*:rnIFL90:rvrIFT00:*");
402 MODULE_ALIAS("dmi:*:rnIFL90:rvrREFERENCE:*");
403 MODULE_ALIAS("dmi:*:rnIFL91:rvrIFT00:*");
404 MODULE_ALIAS("dmi:*:rnJFL92:rvrIFT00:*");
405 MODULE_ALIAS("dmi:*:rnIFT00:rvrIFT00:*");